Synthesis, characterization and optical properties of Y 3 Al 5 O 12 :Ce phosphor by mixed fuel combustion synthesis
Synthesis, characterization and optical properties of Y 3 Al 5 O 12 :Ce phosphor by mixed fuel combustion synthesis
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DOI：
10.1016/j.jallcom.2015.08.076
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发表时间：
2015-11
影响因子：
6.2
通讯作者：
M. Upasani;B. Butey;S. Moharil
中科院分区：
文献类型：
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作者：
M. Upasani;B. Butey;S. Moharil
以甘氨酸-尿素为燃料，在500 ℃下采用一步燃烧法合成了YAG：Ce荧光粉。分析了荧光粉的晶体结构和发光性能。多晶粉末的XRD研究表明，YAG相的形成在低温和微晶尺寸的范围内发现的28 nm的大小。YAG：Ce荧光粉的光致发光发射光谱显示出Ce 3+的宽黄绿色发射。随着Ce 3+掺杂浓度的增加，荧光粉的发射光谱逐渐向长波方向移动，但发射强度却明显下降。用浓度猝灭法计算了能量转移的临界距离。研究了YAG基质中Ce ~（3+）离子间的能量传递机制。浓度猝灭机制可以用Ce ~（3+）离子的电偶极-偶极相互作用来解释。国际照明委员会（CIE）的磷光体坐标研究用于wLED并发现适合用于wLED。
YAG:Ce phosphors have been synthesized by single step combustion synthesis employing glycine-urea fuels at 500C. Crystal structures, luminescent properties of the phosphors are analyzed. XRD study of polycrystalline powder shows the formation of YAG phase at low temperature and crystallite size found in the range of 28 nm size. Photoluminescence emission spectra of YAG:Ce phosphor exhibited broad greenish yellow emission from Ce3+. The emission spectra of phosphors show gradual shift towards longer wavelength with the increase of doping concentration of Ce3+however results in significant decrease in the emission intensity. The critical distance of the energy transfer has been calculated by the concentration-quenching method. The energy transfer mechanism between Ce3+ions in YAG host has been studied in detail. The concentration-quenching mechanism can be explained by the electric dipole–dipole interaction of the Ce3+ions. Commission Internationale de l'Eclairage (CIE) co-ordinate of phosphor studied for and found suitable for wLEDs.